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Integrated pest control in forest management combined use of pheromones and insecticides for attracting and killing the bark beetle ips typographus i. studies with phosphorus 32 labelled methamidophos in the ascending sap of spruce



Integrated pest control in forest management combined use of pheromones and insecticides for attracting and killing the bark beetle ips typographus i. studies with phosphorus 32 labelled methamidophos in the ascending sap of spruce



Forest Ecology and Management 26(1): 47-62



In 1984-1986, 32P-labelled methamidophos was used to investigate the translocation, distribution and breakdown of this systemic insecticide after penetration into the ascending sap of spruce (Picea abies Karst.), following bark treatment with an adhesive paste of 15% active ingredient. The .beta.-radiation of 32P permits a semi-quantitative measurement on the bark of standing trees as well as quantitative sample analysis and autoradiography. The following results are given: method of application and total 32P in the ascending sap; distribution of 32P in trunk cross-section and in bark/needles; 32P in the killed beetles corresponding to the toxic dose, separation of methamidophos and breakdown products; half-life of breakdown in vitro and in vivo; and environmental implications. From the xylem, methamidophos penetrated into the phloem, but no 32P appears outside on the surface of the bark, so that only insects mining inside the bark are killed and no hazards for useful insects, birds and wildlife animals can arise. Trace of 32P were measured in air and water, and no 32P was found in the soil due to the translocation upwards only. The approximate oral toxicity of methamidophos to Ips typographus was estimated to be < 5mg/kg and the half-life in spruce was 45 days (15.degree. C), indicating a sufficient biological effectiveness over several months, preferably in areas of low average temperatures and in trees impaired by environmental pollution.

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Related references

Integrated pest control in forest management - combined use of pheromones and insecticides for attracting and killing the bark beetle Ips typographus. I. Studies with 32P-labelled methamidophos in the ascending sap of spruce. Forest Ecology and Management 26(1): 47-61, 1988

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